Let me keep using the build in wordpress gallery, but I am just trying to find some kind of wordpress plugin that will add abit more functionality.

I am searching to exclude images without removing them, and incorporated images within the gallery which are already in media library.

I found a wordpress plugin that may exclude images ( http://scottrasher.com/wordpress-plugin-for-excluding-gallery-pictures-for-adding-to-post/) but haven't have the ability to find almost anything to include already established images.

http://wordpress.org/extend/plugins/multiple-galleries/ may help, but technically it's only compatible as much as 3..5

The gallery shortcode enables excluding pictures. To incorporate something from media just attach it towards the publish you would like it to display on. Begin to see the codex for more information.